So you could get a pawn promotion using a queen in three moves (assuming there's an empty space on the rear rank and an open path to reach it!), instead of two.

So you could get a pawn promotion using a queen in three moves (assuming there's an empty space on the rear rank and an open path to reach it!), instead of two. (One to combine the queen and pawn, one to move both pieces to the penultimate rank, and one pawn move to achieve the promotion.)